In his nearly four years, George has made knee socks something of his style signature. He wears them in all sorts of hues, from blue to white to black, and the parents of his fellow preschoolers can’t get enough, routinely snatching up pairs from his go-to store, Amaia.

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Charles did his grandson proud with his Scottish-appropriate look on Monday. The royal was in Scotland for a special reason: to see the “Salmon” steam train, which he rode as a child. The train’s engine and windows were destroyed in August 2015, and Charles hopped aboard for the first ride since its refurbishment. The Prince of Wales Foundation, funded the historic train’s repairs, according to The Telegraph.

And though he was far from his grandson, who was likely hanging out home in London or Norfolk with his parents, Prince William and Princess Kate, and nearly 2-year-old sister, Princess Charlotte, it was clear that George wasn’t far from Charles’s mind — or his wardrobe choices.

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Or perhaps, is it that Prince George gets his style inspiration from his grandpa?